Before having introduction of cloud computing let’s have a look on past of IT technologies. In the 80’s it was Home Computing, in the 90’s it was Internet Computing, in the beginning of the 21st century, we have wireless computing. And now what’s next? Of course “The Cloud Computing”! It is the result of innovation and advancement of all these existing technologies. The cloud computing enables individuals or businessmen to cut costs as there is concept of “virtualization” of server and client behind the technology. So, there is no involvement of any infrastructure cost. All the programs and applications are handled virtually. One can access cloud virtually through an internet connection. The server contains open source and or registered software which can be accessed online and used by the user from any computer with internet connection. So in short we can say there is no need of complex hard wired network.
Clouds are broadly classified as Public, Private and Hybrid clouds. Let’s discuss each cloud one by one.
Public Cloud – A Free or Pay –Per –usage model
A cloud is called “Public cloud” if all the services are rendered over a network openly for public use. It is based on standard cloud computing model in which service provider makes resources (applications and storage) available to the public over the internet. Amazon AWS, Microsoft and Google are some of the public cloud providers who own and operate the infrastructure and offer access over the internet .However, the services may be free or on pay-per-usage. Here the users have no control over where the infrastructure is located. All the customers share same infrastructure pool with limited and schemes, security safeguards and availability variances on public clouds.
As far as cost is concerned, it is economical to use public cloud because here infrastructure costs spread among all the users.
Private Cloud – A secure network
Private cloud network is more secure as the cloud infrastructure is dedicated to a particular organization. Here organization can host applications either internally or externally. Data security which is the main concern of any organization is in the single hands. That’s why it is more secure although self run data centers are required which are generally considered an additional expenditure.
Hybrid Cloud – Combination of both Private and Public Cloud
Hybrid cloud computing is based on the composition of two or more clouds (private, public) which remain unique in their entities and are bound together for offering benefits of multiple deployed models. Hybrid cloud is preferably beneficial to use when your company wants to offer services to different vertical markets. In this situation public cloud computing is used to interact with the customers and in the same time their data can be secured by using private cloud.
The Cloud computing has changed the way how people interact, and do businesses in the modern world. This technology is the new wave of innovation for individuals, businesses as well as governments.